Automatic stop control for sewing machines



w. R. ROGERS 1,913,089

AUTOMATIC STOP CONTROL- FOR SEWING MACHINES 2 Sheets-Sheet 1 Juney 6, 1933.

Filed June 30, 1931 Humm-1 l fa i 5 J/ June 6, 1933. w. R. ROGERS AUTOMATIC STOP CONTROL FOR SEWING MACHINES 2 Sheets-Sheet 2 Filed June 30, 1931 an M .m W

i 25 on line 1 4 of Figure 3.

Patented June 6, `1933 y l *Y 'i UNITE-DisTATEs PATENT OFFICE i l l i WILLIAiu R. Boelens, or wEs'rFIELnN-nw JEnsnY i AUTOMATIC siror eoN'rnoL ron psr-:WING iviiieniivns Appncatiqn inea June eo, 1931.` seriaiNo. 548,007. Y

y Thisinvention relates `to an `automatic extendingbelow the horizontal extension electric lock stop device especially adaptable `17 and upwardly through a suitable open- `for` use onrpowerfsewing machines; and it ing provided in the sewing machine base 10, A hasfor itsobjectto provide a simple, inexterminating short of the lower portion of v, pensive and efficient *automatic stop device. the housing 12. Secured to the base l0 `in Another object of Athis device is to pro-` any desired manner is a spring seat 26, said vide in the electric lock employed a manual seat being provided with an opening control means for actuatingthe lock in case through which the plunger rod extends `of any failure in the current that normally as clearlyshown in Figures 1 and 2.I operates thesame. Rigidly attached to the upper and lower "'29 Other objectsfof thisinvention will beends ofthe plunger rod 25 are knobs27 and come apparent as the description thereof 28, respectively; A compressioncoil spring given hereunder proceeds, reference being 29 is provided on the rod 25, the purpose of had to the accompanying drawings, where which is to `be hereinafter described, said "15. ini-:- `i coil "spring 29 being seated on the spring Figure 1 is an elevational View of the seat 26, (Figsfl and 2). To adjust the coinautoinatic stop device as applied to a power pression of the spring 29 an adjusting collar sewing machine. is provided on `the plunger rod 25, the i y Figure 2 is a sectional view of said deposition of which is regulated bythe set 20 viceutaken on line 2-2 of Figure 1. screw 31. t@

i Figure 3 is a detail sectional view of the Connected to the brackets22 of the frame electric lock mechanism taken on line 3-3 of' 13is a guide member 32 provided with a cen- Figure 2, l tral vertical` slot Working in said slot Figure lisa detail sectional view taken is guide screw 311, the threaded end of v which is horizontally threaded within the W Referring to `Figure 1, there is shown a plunger rod :25 and extends beyond the sursewing machinebase 10, a standard 11 carface thereof -for a slight distance as clearly rying the `conventional sewing mechanism shown in Figure 2, said screw being locked (not shown) in the cantilever housing 12 in position by the lock nut 35. 30 `integral With said standard in the manner Pivoted to the plunger rod 25 beneathV the well known. l y guidelscrew 34 is stop member 36, said stop i y Attached to the underneath portion of the mem'berw36 `beging of U-cross section, see `base 1,0, is a frame 13 comprising vertical Figure 3, the arms orside walls of which arms 14 `and 15, lugs 16 for` securing the are mounted on the pivot pin 37 which supframe to Vthe base, and an horizontalexten ports said stop member. To maintainsaid 35 sion 17 on the lower' end of the arm 15. stop member 36in operativeposition a small Extending between the arms 14- and 15 coil spring 38is employed, said spring beandhorizontally secured thereto by screws ing positioned within said stop member and 18 is an electro-magnetic lock 19 of cononthe extended end of theguide screw 34, -40 Ventional design, provided with bindingin abutting engagement with the plunger 99 posts 20. This lock 19 is of the conventionrod 25 so` as to` constantly `urge the stop al type used on front doors in apartment member outwardly. `It is apparent that due houses, whereby a button pressed in a disto the guide screw 311 working in the guide tant apartment allows the front door to be 32 that the plunger rod25while capable of pressed open. A similar binding post 21 is vertical up and down movement cannot turn. @5

attached to the end of the extension 17. When the plunger rod 25 ispushed down Formed integral with the frame 13 are rearso that the stop 36 engages the latch 4() wardly extending brackets 22 provided with of the electric lock 19, the knob 28 on` the registering vertical openings 23, adapted to lower end of the rod 25 will `engage the T slidably receive a plunger rod 25, said rod lever" i431; thereby closing the `clutch 42 so m0 as to permitoperation of the sewing machine. As long as the knob 28 engages the lever 41 in the position shown in Figure 1, power will be delivered to operate the sew- 5 ing` machine in the manner well known.

` readily apparent.

To stop the sewing machine when there is a break in the thread 45 there is provided a switch 46 of the type disclosed in my Patent No. 1,744,678, granted January 21, 1930, adapted to be closed by a trip member 47 pivotally mounted on the thread pulley 48.

The switch 46 is connected by suitable conduetors 49 to a source of relectrical supply as per example the battery 50.

In case there is a break in the thread when the machine is in operation the trip member 47 will move downward in a counter-clockwise direction closing the switch 46 and thereby energizing the electro-magnets (not shown) in the lock 19. The electromagnet and lock 19 are of conventional construction such as shown in U. S. patent to Schneider, 1,072,996, Sept. 9th, 1913; Guette, 1,121,090, Dec. 15, 1914; and Weiss, 1,618,738, Feb. 22nd, 1927. Said magnets when energized will draw the trigger 51 (Figure inwardlyinto alignment with the notch 52 in the latch bar 53, permitting latch bar 53 to be pivoted downwardly about its pivot in a clockwise direction thereby permitting the lever latch 40 to be operated against the action of the torsion spring 54 in the well known manner as the tail on latch 40 is permitted to pass out of the recess shown in dotted outline in the pivot of latch bar 53 in Figure 3. Said lever latch 40 when operating will be swung about its piyots in a counter clockwise direction, as lviewed in Figure 2, by the stop 36 pressing upwardly thereagainst until said latch 40 is depressed out of engagement with the stop 36 which will therefore permit the plunger rod 25 to move upwardly under the action of the spring 29 to the dotted position shown in Figure 1. When the plunger rod 25 moves away from the lever 41, the clutch 42 will be released thereby stopping the operation of the sewing machine.

In case it is desired to manually operate the lever latch 40 of the electric lock 19 there is provided a push member 55 slidably positioned in the side walls of the lock 19 (see Figure 4) and provided with a reentrant portion 56 which upon a pull being exerted on the push member 55 will cause the trigger 51 to move inwardly in the manner This push member 55 serves as a safety means to actuate the lock 19 to release the stop 36 in case the electrical supply shouldfail for any reason. While a preferred embodiment of automatic stop control has been disclosed, the same is susceptible of various changes within the scope of the appended claims.

Having thusset forth and disclosed the nature of this invention, what is claimed is:

1. In combination with a sewing machine comprising a base and housing, a clutch and a clutch control lever pivoted to the under surface of said base and connected to said clutch, a frame secured to the under surface of said base, an electro-magnetic lock on said frame, a plunger rod slidably mounted on said frame and extending upwardly through said base and downwardly beneath said frame, knobs on the ends of said plunger rod, a stop member pivotally mounted on said plunger rod and adapted to coact with the latch of said lock, guide means on said frame and plunger rod, a compression coil spring on said plunger rod seated on the upper surface of said base, and means on said plunger rod to adjust the compression of said'coil spring, said rplunger rod when in locked engagement withsaid electro-magnetic lock having the lower knob thereof in engagement with said clutch control lever to maintain said clutch in operation to transmit power, v

2. In combination with a sewing machine comprising a base and housing, a clutch and a clutch control lever pivoted to the under surface of said base and connected to said clutch, a frame secured to the under surface of said base, an electro-magnetic lock on said frame, a plunger rod slidably mounted on said frame and extending upwardly through said base and downwardly beneath said frame, knobs on the ends of said plung ver rod, a stop member pivotally mounted on said plunger rod and adapted to coact with the latch of said lock, guide means on said frame and plunger rod, a compression coil spring on said plunger rod seated on the upper surface of said base, and means on said plunger rod to adjust the compression of said coil spring, said plunger rod when in locked engagement with said electro-magnetic lock having the lower knob thereof in engagement with said clutch control lever to maintain said clutch in operation to transmit power, a manually operated push member in said electro-magnetic lock adapted to engage the trigger thereof upon movement of the same to open said lock with a consequent release of the plunger rod.

In testimony whereof I affix my signature.

WILLIAM R. ROGERS. 

